25 Fittest Female Celebs

The leading lady's head-turning curves, the Grammy Award winner's killer legs, the television host's enviable abs—we've seen the best that every ultra fit A-lister has to offer. More importantly, we asked all 25 of them how they did it

At 47, Courteney has never looked better. Her secret? Interval training, which fires up her metabolism and burns more fat. Courteney's trainer, Michelle Lovitt, varies her cardio between the elliptical and treadmill. Michelle also keeps Courteney's body guessing with resistance-band and power-plate strength training.

If you've reached a workout plateau, give this interval training routine a try. It combines fat-burning cardio with moves that target your entire core rather than individual muscles, so you'll burn more fat while toning up.

Running is the one exercise Olivia will not do anymore. At 31, she prefers surfing, hiking, and Pilates. Her healthy-eating guideline is simple: If she can't see it, she won't eat it, so she keeps unhealthy foods at bay.

Nicole's trainer, Adam Ernster, focuses on building muscle. Nicole gets those killer abs by using a stability ball to do crunches, which makes them more challenging. To tone her legs, she runs, dances, and does plenty of squats and lunges. By avoiding carbs, dairy, salt, and late-night munching, Nicole is able to keep her physique tight.

Controlling your sodium intake is more complicated than just putting down the saltshaker. You may be surprised by some of the saltiest foods out there.

Trainer Harley Pasternak has worked with 45-year-old Halle—putting her through his 5-Factor plan, a fast-paced strength-training and cardio circuit that takes only 25 minutes! One of the actress's favorite workouts, kickboxing, tones her arms without adding too much bulk.

Women's boxing will make its debut at the 2012 Olympics in London, marking the first time that all summer sports will have female athletes. Go for the gold with this do-anywhere boxing workout!

Post-workout pics of this 23-year-old actress regularly circulate celeb websites. Each photo captures her healthy exercise glow along with some awesome workout clothes. Hey, sometimes the perfect gym outfit can be all the workout motivation you need!

When she's not surfing (one of her passions), the 39-year-old SoCal native sculpts her long legs and tightens her tummy by joining trainer Teddy Bass in the gym—three or four days a week, 60 minutes a session—for either Pilates, cardio, weight training, or a mix of all three! And although this girl loves food, she has no problem cutting out white sugar and alcohol to slim down before big events.

Get jaw-dropping results with this Pilates workout! It combines the body-sculpting benefits of Pilates with fat-melting cardio training.

Take control of your appetite! The Belly Melt Diet is designed to keep hunger hormones in control. Buy the book!

Maria—in spite of two cracked ribs and injured feet—is in awesome shape thanks to her participation on Dancing with the Stars. That's not to say she didn't have a killer body before her DWTS debut! Maria's used to getting creative with at-home (or at-hotel) workouts and trains with Andrea Orbeck on a regular basis.

The 24-year-old Barbados native exudes confidence when she's walking those white-sand beaches in a tiny bikini, but it's not without hard work. When she's on the road, the singer does her best to squeeze in at least three workouts a week, at least 25 minutes a day. Biking or cycling are also part of her regular cardio routine, as well as exercises like jumping rope without a rope, stationary jogging, and jumping jacks.

She's also worked with celebrity trainer Harley Pasternak on her diet—incorporating five well-balanced meals a day that are packed with protein, fiber, healthy carbs and fats, and a sugar-free beverage.

This 31-year-old Golden Globe–nominated actress and mom refers to herself as an amateur chef. In fact, some of Jessica's recipes have been featured on sites such as Epicurious.com. By cooking at home, Jessica knows exactly what goes into her food: nothing artificial.

Jessica's all-natural lifestyle doesn't stop in the kitchen. She's actively involved with charities such as Safer Chemicals, Healthy Families, ONE, Habitat for Humanity, and Project H.O.M.E., and she even founded The Honest Company, which creates unquestionably safe and eco-friendly baby products.

The 35-year-old former ballet dancer isn't a fan of the gym. Her hiking and camping hobbies keep her svelte, while her love of cooking has made it easy to keep a clean diet. When this actress feels as if she's gained weight, she simply watches her portions.

The 26-year-old Sports Illustrated swimsuit model has a kick-butt workout—literally. The Israeli supermodel's trainer takes her through different martial-arts-style kicking sequences that work the abs, butt, and legs.

When Kate's not running after her two sons, Ryder and Bingham, she catches a Pilates session or dance class. She's also a fan of Core Fusion, a mix of yoga, Pilates, ballet, and strength training.

As for diet, Kate's trainer Ashley Conrad recommends eating five times a day—making sure to include lots of lean protein. Not sure which proteins are the best? We sort it all out for you with this protein prescription plan.

The 28-year-old likes to hike with her dogs, a bulldog named Lola that she lovingly refers to as "a side of ham" and a fluffy mutt that goes by the name of Paco. Although Olivia tries to avoid eating bread and pasta, her love of Italian food makes that difficult. Portion control is key for this toned actress.

Don't be afraid of carbs. Whole grains are nutritional all-stars. Eating them can help reduce the risk for heart disease and diabetes and may even help you lose weight. Just be wary of these bad carbs.

Those curves aren't from trips to the gym. This 30-year-old's favorite form of exercise is dancing "or some sort of sport," she says.

Rachel reinvested in tennis equipment (she played as a kid) so she and friends could hit the courts in L.A.'s Griffith Park, which is also a great place to hike. On days when she doesn't feel like leaving the house, she pops in a yoga DVD.

You would never guess that this multitalented 19-year-old struggled with a junk-food problem. But that is reportedly what landed Selena in the hospital last year. Fast-forward one year and she says she's eating healthier and feeling better! Simple changes like adding more lean protein and vegetables can make all the difference.

Training for her role on Smash keeps this 28-year-old starlet in killer shape! When she's not in five-hour dance rehearsals prepping for her role as Karen Cartwright, she works with personal trainer Oscar Smith. Smith's routines incorporate dynamic moves like burpees, pushups, and alternating lunge jumps.

This 40-year-old mom of four shares her workout secrets in her Transform Your Body DVD. In this challenging fat-burning workout, Brooke leads you through a three-part sequence of dynamic exercises that work your total body.

After you sweat it out, make sure to fully cool down. Incorporate these post-workout tips for a well-rounded exercise routine.

Lea stays in shape by tackling the trails in picturesque Runyon Canyon—a 15-minute drive from her apartment—and working out with L.A. health counselor Devon Butler. "We do a lot of yoga during red-carpet season," says Butler. "Lea has so much attention on her, and this is so calming." Lea especially likes Bikram, poses and breathing exercises done in a heated studio for deeper stretching and stress relief.

Thinking of incorporating yoga into your workout routine? Here are some facts about Bikram yoga.

This 33-year-old model is known for her phenomenally flat belly. Her secret? She targets her obliques. "Working your obliques pulls everything together and gives you a slim waist," says Marisa. One of her favorite moves is the alternating crunch.

When it comes to keeping a diet on track, she offers this advice: "Eating smart is all about having an awareness of your body. The most obvious way to do that is by seeing it. So when you're trying to lose weight, spend more time wearing less."

This multitalented 23-year-old hates the gym and turns to celeb fitness trainer Tracy Anderson for total-body "dance-y" workouts. When on the road, she mixes up sessions with her trainer and P90X DVDs. After all that hard work, Julianne follows a strict diet. When dining out, her order generally looks like this: a mixed green salad with lemon (and without cheese) and salmon with mixed vegetables—no oil or salt.